rollup.config.js

import babel from 'rollup-plugin-babel';
import resolve from 'rollup-plugin-node-resolve';
import builtins from 'rollup-plugin-node-builtins';
import globals from 'rollup-plugin-node-globals';
import pkg from './package.json';

const extractExternals = () => [
  ...Object.keys(pkg.dependencies || {}),
  ...Object.keys(pkg.peerDependencies || {}),
];

export default {
  input: 'src/index.js',
  output: [
    {
      file: pkg.main,
      format: 'cjs',
      sourcemap: true,
    },
    {
      file: pkg.module,
      format: 'es',
      sourcemap: true,
    },
  ],
  external: extractExternals(),
  plugins: [
    babel({
      babelrc: false,
      exclude: 'node_modules/**',
      presets: [
        '@babel/preset-env',
        '@babel/preset-react',
        '@babel/preset-flow',
      ],
    }),
    resolve({
      mainFields: ['module', 'main', 'jsnext', 'browser'],
    }),
    globals(),
    builtins(),
  ],
};